::Description
This grade has become synonymous with the type of roll used in various stands of hot and cold strip and plate mills.within this context,the high chrome alloy ironis used for the working layer shell of the barrel,core and necks being either flake or nodular graphite irons.Development of this high chrome shell material followed from the use of a steel shell/iron cored work roll in wide hot strip mills,which itselfhad been used in preference to indefinite chill rolls to overcome "banding" of the roll surface.banding of a work roll surface is a complex phenomenon,but the simplified reason for the use of high chrome rolls is to improve roll surface oxidation resistance,increase the tenacity of oxide to the surface and reduce firecraze and firecrack depth to the minimum possible.Highe chrome materials are also well-known for their abrasion resistance properties.
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::Application:
Mainly used for the front 3 and 4 finishing racks of continuous strip mill and the post rack of rough mill.
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::Properties:
Thanks to its high content of M7C3 type eutectic carbide in a range of 20-30% and discontinuous network distribution of carbide,the roll offers a high wear resistance performance.The matrix is finely-disseminated secondary carbides(M7C3,M23C6 and M3C types),increasing therefore the wear resistance of roll ,the Cr2O3 enriched oxide film on the roll surface is highly resistant to oxidization and plastic strain,making the roll extremely suitable for steel hot milling process.
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::Mechanical Properties
Hardness of roll surface HSD65-80
hardness of roll collar HSD35-48
Tensile strength of core ≥400MPa
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::Chemical composition
C Si Mn Cr Ni Mo
2.4/3.0 0.4/0.6 0.8/1.2 16.0/20.0 0.8/1.5 0.8/2.0
::Contact Us:
Leo Lee
Seals Manager
Phone:+86-411-82506195 82506197
Fax:+86-411-82336278
Msn:hover.lee@hotmail.com
Email: leolee158@foxmail.com
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